Sorry, I don't have an answer to this, but just to note, you'll want the CMYK colors for the buttons, not the RGB.
RGB (red, green, blue) is for on-screen only. CMYK (Cyan, Magenta, Yellow, Black) is for printing. Things that look great on-screen, don't always print in those same colors, so that's why you need CMYK or pantone spot colors as the constant.